#include <bits/stdc++.h>
#include "grader.h"
using namespace std;
const int MAXN = 1005;
vector<int> adj[MAXN];
vector<int> order;
void buildOrder(int u, int p) {
order.push_back(u);
for (int v : adj[u]) {
if (v != p) {
buildOrder(v, u);
}
}
}
int findEgg(int N, vector<pair<int, int>> bridges) {
for (int i = 1; i <= N; i++) adj[i].clear();
order.clear();
for (auto edge : bridges) {
adj[edge.first].push_back(edge.second);
adj[edge.second].push_back(edge.first);
}
buildOrder(1, 0);
int low = 0, high = N - 1;
int ans = order[N - 1];
while (low <= high) {
int mid = low + (high - low) / 2;
vector<int> current_query;
for (int i = 0; i <= mid; i++) {
current_query.push_back(order[i]);
}
if (query(current_query) == 1) {
ans = order[mid];
high = mid - 1;
} else {
low = mid + 1;
}
}
return ans;
}
